使用gradle从nexus服务器复制最新的jar文件

Question

我正在尝试使用Gradle从Nexus服务器复制最新的jar文件(com.bar.baz:mapping:0.0.1-snapshot)。

apply plugin: "java"

repositories {
    maven {
        credentials  {
            username = "${mavenUser}"
            password = "${mavenPassword}"
        }
        url "https://nexus.cluster.foo.cloud/repository/maven-snapshots"
        authentication {
            basic(BasicAuthentication)
        }
    }
}

configurations {
    copyConf
}

dependencies {
    copyConf group: "com.bar.baz", name: "mapping", version: "0.0.1-20190508.085532-7"
}

task copyTask(type: Copy) {
    from configurations.copyConf
    into "."
}

使用版本“latest.integration”而不是“0.0.1-20190508.085532-7”（并调用Gradle copyTask--refresh-dependencies--stacktrace)将得到：

FAILURE: Build failed with an exception.

* What went wrong: Could not resolve all files for configuration ':copyConf'.
> Could not find any matches for com.bar.baz:mapping:latest.integration as no versions
of com.bar.baz:mapping are available.   Searched in
the following locations:
      https://nexus.cluster.foo.cloud/repository/maven-snapshots/com/ba/baz/mapping/maven-metadata.xml
      https://nexus.cluster.foo.cloud/repository/maven-snapshots/com/bar/baz/mapping/0.0.1-SNAPSHOT/maven-metadata.xml
      https://nexus.cluster.foo.cloud/repository/maven-snapshots/com/bar/baz/mapping/0.0.1-SNAPSHOT/mapping-0.0.1-20190508.085534-8.pom
      https://nexus.cluster.foo.cloud/repository/maven-snapshots/com/bar/baz/mapping/0.0.1-SNAPSHOT/mapping-0.0.1-20190508.085534-8.jar
Required by:
      project :

* Try: Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is: org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException:
Could not resolve all files for configuration ':copyConf'.
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.rethrowFailure(DefaultConfiguration.java:918)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.access$1600(DefaultConfiguration.java:116)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration$ConfigurationFileCollection.getFiles(DefaultConfiguration.java:892)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.getFiles(DefaultConfiguration.java:404)
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration_Decorated.getFiles(Unknown
Source)
        at org.gradle.api.internal.file.collections.DefaultFileCollectionResolveContext$FileTreeConverter.convertInto(DefaultFileCollectionResolveContext.java:206)
        at org.gradle.api.internal.file.collections.DefaultFileCollectionResolveContext.doResolve(DefaultFileCollectionResolveContext.java:116)
…

更新：

使用版本“0.0.1-snapshot”而不是“0.0.1-20190508.085532-7”（并调用Gradle CopyTask--Refresh-Dependencies--StackTrace)会产生几乎相同的错误，唯一的区别是：

>

第2行改为：

找不到com.bar.baz：映射：0.0.1-快照。

位置https://nexus.cluster.foo.cloud/repository/maven-snapshots/com/ba/baz/mapping/maven-metadata.xml中没有搜索

使用版本“0.0.1”而不是“0.0.1-20190508.085532-7”（并调用Gradle copyTask--Refresh-Dependencies--StackTrace)将得到：

FAILURE: Build failed with an exception.

* What went wrong:
Could not resolve all files for configuration ':copyConf'.
> Could not resolve com.bar.baz:mapping:0.0.1.
  Required by:
      project :
   > Could not resolve com.bar.baz:mapping:0.0.1.
      > Could not get resource 'https://nexus.cluster.regulator.cloud/repository/maven-snapshots/com/bar/baz/mapping/0.0.1/mapping-0.0.1.pom'.
         > Could not GET 'https://nexus.cluster.regulator.cloud/repository/maven-snapshots/com/bar/baz/mapping/0.0.1/mapping-0.0.1.pom'. Received status code 400 from server: Bad Request

* Try:
Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Exception is:
org.gradle.api.internal.artifacts.ivyservice.DefaultLenientConfiguration$ArtifactResolveException: Could not resolve all files for configuration ':copyConf'.
        at org.gradle.api.internal.artifacts.configurations.DefaultConfiguration.rethrowFailure(DefaultConfiguration.java:918)
...

另一个更新：

使用maven从nexus服务器复制最新的jar文件确实有效，使用以下pom.xml：

<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.bar.baz</groupId>
  <artifactId>TAndMapping</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>${project.artifactId}</name>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <mapping>mapping</mapping>
  </properties>
  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-dependency-plugin</artifactId>
        <version>3.1.1</version>
        <executions>
          <execution>
            <id>copy</id>
            <phase>package</phase>
            <goals>
              <goal>copy</goal>
            </goals>
          </execution>
        </executions>
        <configuration>
          <artifactItems> 
            <artifactItem>
              <groupId>com.bar.baz</groupId>
              <artifactId>${mapping}</artifactId>
              <version>0.0.1-SNAPSHOT</version>
              <type>jar</type>
              <overWrite>true</overWrite>
              <destFileName>${mapping}.jar</destFileName>   
            </artifactItem>
          </artifactItems>
          <overWriteSnapshots>true</overWriteSnapshots>
        </configuration>
      </plugin> 
    </plugins>
  </build>
  <repositories>
    <repository>
      <id>nexus-snapshots</id>
      <name>Snapshot</name>
      <url>https://nexus.cluster.regulator.cloud/repository/maven-snapshots/</url>
    </repository>
  </repositories>
</project>

另一个更新：切换到Gradle5.4.1，我得到了一些不同的stacktraces：

null

null

对于版本0.0.1:

null

另一个更新：由于@Louis Jacomet的回答，我更详细地查看了我们的Nexus服务器，当前，.../com/bar/baz/mapping/0.0.1-snapshot/maven-metadata.xml列出了：

<metadata modelVersion="1.1.0">
<groupId>com.bar.baz</groupId>
<artifactId>mapping</artifactId>
<version>0.0.1-SNAPSHOT</version>
<versioning>
  <snapshot>
    <timestamp>20190516.163117</timestamp>
    <buildNumber>2</buildNumber>
  </snapshot>
  <lastUpdated>20190516163117</lastUpdated>
  <snapshotVersions>  
    <snapshotVersion>
      <extension>jar</extension>
      <value>0.0.1-20190516.163116-1</value>
      <updated>20190516163117</updated>
    </snapshotVersion>
    <snapshotVersion>
      <extension>pom</extension>
      <value>0.0.1-20190516.163116-1</value>
      <updated>20190516163117</updated>
    </snapshotVersion>
  </snapshotVersions>
</versioning>
</metadata>

因此，gradle在https://nexus.cluster.regulator.cloud/repository/maven-Snapshots/com/bar/baz/mapping/0.0.1-snapshot/mapping-0.0.1-20190516.163117-2.jar中进行搜索。它找不到它，因为Nexus服务器上唯一可用的版本是版本0.0.1-20190516.163116-1。我不明白为什么会这样，我猜这是一个Nexus bug而不是Gradle bug。但是，通过Maven进行复制（请参阅pom.xml的第二次更新）仍然可以在Nexus上找到0.0.1快照版本并下载它。

Answer 1

看来你要

org.gradle.internal.resource.transport.http.HttpErrorStatusCodeException: Could not GET 'https://nexus.cluster.regulator.cloud/repository/maven-snapshots/com/bar/baz/mapping/0.0.1/mapping-0.0.1.pom'. Received status code 400 from server: Bad Request

鉴于此，最有可能的解释是存储库的配置是错误的。检查为Maven设置的身份验证类型，或者在接受到Nexus实例的连接之前检查您的内部组织是否进行了其他检查。

因此很明显，Nexus中的maven-metadata.xml文件与Gradle解析的内容不匹配。

if ("metadata/versioning/snapshot/timestamp".equals(getContext())) {
    mavenMetadata.timestamp = getText();
}
if ("metadata/versioning/snapshot/buildNumber".equals(getContext())) {
    mavenMetadata.buildNumber = getText();
}
if ("metadata/versioning/versions/version".equals(getContext())) {
    mavenMetadata.versions.add(getText().trim());
}

有两种选择：

1. 发布另一个快照，并查看这是否解决了maven-metadata.xml不一致性。
2. 针对Gradle提出问题，要求改善对这些角落案例的支持